coccyx Flashcards Preview

Spinal anatomy quiz questions > coccyx > Flashcards

Flashcards in coccyx Deck (15):
1

What is the number of coccygeal somites?

ten

2

What is the typical number of segments that unite to form the adult coccyx?

4 segments

3

When is ossification of coccyx completed?

about age 30

4

What is the direction of fusion of coccygeal segments?

from caudal to cranial, the last segments to fuse together are Co1 and Co2

5

What is the direction of the coccygeal curve?

posterior (kyphotic)

6

What is the major motion and range of motion for coccyx?

flexion - extension, 5-20 degrees

7

How many coccygeal nerves are present in the fetus?

typically five pairs of coccygeal nerves are present

8

How many coccygeal nerves are present in the adult?

typically only one pair of coccygeal nerves remain in the adult

9

What forms the coccygeal nerve plexus?

S4, S5 and Co1 nerves

10

What is the ganglion impar?

a midline sympathetic ganglion

11

What innervates the coccygeal glomus or coccygeal body?

both sympathetic and parasympathetic fibers are identified

12

What muscles attach to the coccyx?

ischiococcygeus and levator ani

13

What joint classifications are present for coccyx?

cartilaginous (amphiarthrosis) symphysis and fibrous (amphiarthrosis) syndesmosis

14

What forms the posterior boundary for the first coccygeal spinal nerve intervertebral foramen?

sacral cornu, coccygeal cornu, superficial posterior sacrococcygeal ligament, intercornual ligament

15

What forms the anterior boundary for the first coccygeal spinal nerve intervertebral foramen?

vertebral body S5, vertebral body Co1, deep posterior sacrococcygeal ligament, intervertebral disc

Decks in Spinal anatomy quiz questions Class (89):